Sir Jonathan Trelawny (17 December 1568 – 21 June 1604), of Pool in Menheniot, Cornwall, was an English Member of Parliament. Trelawny was the posthumous younger son of John Trelawny of Pool (who had been High Sheriff of the county); his elder brother died in infancy and he inherited the estate. He entered Parliament as member for Liskeard, representing that borough in three parliaments, and subsequently also represented Cornwall in the Parliaments of 1597 and 1604. On one occasion he was sent to the Tower of London for losing his temper during a parliamentary debate where he "dealt his opponent, Mr Ashe, a thundering box to his ear" and "flashed his sword".